US3741975A - Process for the production of n-ethyl-n-(gamma-picolyl) tropamide andintermediate therefor - Google Patents
Process for the production of n-ethyl-n-(gamma-picolyl) tropamide andintermediate therefor Download PDFInfo
- Publication number
- US3741975A US3741975A US00097374A US3741975DA US3741975A US 3741975 A US3741975 A US 3741975A US 00097374 A US00097374 A US 00097374A US 3741975D A US3741975D A US 3741975DA US 3741975 A US3741975 A US 3741975A
- Authority
- US
- United States
- Prior art keywords
- ethyl
- picolyl
- grams
- tropamide
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title abstract description 11
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- JJCZGVLYNIVKKD-UHFFFAOYSA-N 3-hydroxy-2-phenylpropanamide Chemical compound NC(=O)C(CO)C1=CC=CC=C1 JJCZGVLYNIVKKD-UHFFFAOYSA-N 0.000 title 1
- LSBDFXRDZJMBSC-UHFFFAOYSA-N 2-phenylacetamide Chemical compound NC(=O)CC1=CC=CC=C1 LSBDFXRDZJMBSC-UHFFFAOYSA-N 0.000 abstract description 4
- VMZCDNSFRSVYKQ-UHFFFAOYSA-N 2-phenylacetyl chloride Chemical compound ClC(=O)CC1=CC=CC=C1 VMZCDNSFRSVYKQ-UHFFFAOYSA-N 0.000 abstract description 4
- 150000001408 amides Chemical class 0.000 abstract description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 abstract 1
- 150000001299 aldehydes Chemical class 0.000 abstract 1
- HEDRZPFGACZZDS-UHFFFAOYSA-N chloroform Substances ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 13
- 239000000243 solution Substances 0.000 description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 7
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000002262 Schiff base Substances 0.000 description 5
- 150000004753 Schiff bases Chemical class 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 5
- -1 alkyl formate Chemical compound 0.000 description 5
- ZBAMQLFFVBPAOX-UHFFFAOYSA-N n-(pyridin-4-ylmethyl)ethanamine Chemical compound CCNCC1=CC=NC=C1 ZBAMQLFFVBPAOX-UHFFFAOYSA-N 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- VBSTXRUAXCTZBQ-UHFFFAOYSA-N 1-hexyl-4-phenylpiperazine Chemical compound C1CN(CCCCCC)CCN1C1=CC=CC=C1 VBSTXRUAXCTZBQ-UHFFFAOYSA-N 0.000 description 4
- JACRWUWPXAESPB-QMMMGPOBSA-N Tropic acid Natural products OC[C@H](C(O)=O)C1=CC=CC=C1 JACRWUWPXAESPB-QMMMGPOBSA-N 0.000 description 4
- 125000002485 formyl group Chemical group [H]C(*)=O 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000000543 intermediate Substances 0.000 description 3
- 229960004592 isopropanol Drugs 0.000 description 3
- BGUWFUQJCDRPTL-UHFFFAOYSA-N pyridine-4-carbaldehyde Chemical compound O=CC1=CC=NC=C1 BGUWFUQJCDRPTL-UHFFFAOYSA-N 0.000 description 3
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 2
- 229910000564 Raney nickel Inorganic materials 0.000 description 2
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 2
- BGDKAVGWHJFAGW-UHFFFAOYSA-N Tropicamide Chemical compound C=1C=CC=CC=1C(CO)C(=O)N(CC)CC1=CC=NC=C1 BGDKAVGWHJFAGW-UHFFFAOYSA-N 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000006268 reductive amination reaction Methods 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910000033 sodium borohydride Inorganic materials 0.000 description 2
- 239000012279 sodium borohydride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229960004791 tropicamide Drugs 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BSKHPKMHTQYZBB-UHFFFAOYSA-N 2-methylpyridine Chemical compound CC1=CC=CC=N1 BSKHPKMHTQYZBB-UHFFFAOYSA-N 0.000 description 1
- XVMSFILGAMDHEY-UHFFFAOYSA-N 6-(4-aminophenyl)sulfonylpyridin-3-amine Chemical compound C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=N1 XVMSFILGAMDHEY-UHFFFAOYSA-N 0.000 description 1
- 229930003347 Atropine Natural products 0.000 description 1
- ZTVIKZXZYLEVOL-MCOXGKPRSA-N Homatropine Chemical compound O([C@H]1C[C@H]2CC[C@@H](C1)N2C)C(=O)C(O)C1=CC=CC=C1 ZTVIKZXZYLEVOL-MCOXGKPRSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- RKUNBYITZUJHSG-UHFFFAOYSA-N Hyosciamin-hydrochlorid Natural products CN1C(C2)CCC1CC2OC(=O)C(CO)C1=CC=CC=C1 RKUNBYITZUJHSG-UHFFFAOYSA-N 0.000 description 1
- 238000007192 Meerwein reaction reaction Methods 0.000 description 1
- 239000007868 Raney catalyst Substances 0.000 description 1
- CIUQDSCDWFSTQR-UHFFFAOYSA-N [C]1=CC=CC=C1 Chemical compound [C]1=CC=CC=C1 CIUQDSCDWFSTQR-UHFFFAOYSA-N 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- RKUNBYITZUJHSG-SPUOUPEWSA-N atropine Chemical compound O([C@H]1C[C@H]2CC[C@@H](C1)N2C)C(=O)C(CO)C1=CC=CC=C1 RKUNBYITZUJHSG-SPUOUPEWSA-N 0.000 description 1
- 229960000396 atropine Drugs 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006196 deacetylation Effects 0.000 description 1
- 238000003381 deacetylation reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229960000857 homatropine Drugs 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- CBOIHMRHGLHBPB-UHFFFAOYSA-N hydroxymethyl Chemical compound O[CH2] CBOIHMRHGLHBPB-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- HZVOZRGWRWCICA-UHFFFAOYSA-N methanediyl Chemical group [CH2] HZVOZRGWRWCICA-UHFFFAOYSA-N 0.000 description 1
- 239000002637 mydriatic agent Substances 0.000 description 1
- 230000002911 mydriatic effect Effects 0.000 description 1
- BQSUUGOCTJVJIF-UHFFFAOYSA-N n-(pyridin-2-ylmethyl)ethanamine Chemical compound CCNCC1=CC=CC=N1 BQSUUGOCTJVJIF-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- CFHIDWOYWUOIHU-UHFFFAOYSA-N oxomethyl Chemical compound O=[CH] CFHIDWOYWUOIHU-UHFFFAOYSA-N 0.000 description 1
- 238000004816 paper chromatography Methods 0.000 description 1
- 210000005037 parasympathetic nerve Anatomy 0.000 description 1
- WLJVXDMOQOGPHL-UHFFFAOYSA-N phenylacetic acid Chemical class OC(=O)CC1=CC=CC=C1 WLJVXDMOQOGPHL-UHFFFAOYSA-N 0.000 description 1
- 150000003138 primary alcohols Chemical class 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003254 radicals Chemical group 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/36—Radicals substituted by singly-bound nitrogen atoms
- C07D213/40—Acylated substituent nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/36—Radicals substituted by singly-bound nitrogen atoms
- C07D213/38—Radicals substituted by singly-bound nitrogen atoms having only hydrogen or hydrocarbon radicals attached to the substituent nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/44—Radicals substituted by doubly-bound oxygen, sulfur, or nitrogen atoms, or by two such atoms singly-bound to the same carbon atom
- C07D213/53—Nitrogen atoms
Definitions
- the present invention relates to a process for the production of N-ethyl-N-( y-picolyD-tropamide and intermediate therefor.
- the said process is characterized by the steps of:
- N-ethyl-y-picolylamine is produced by reacting 4-halogen methylpyridine with ethylamine according to the aforementioned patent by G. Rey-Bellet et al., however we have accomplished to produce Nethyl-'y-picolylamine at a quantitative yield by the reductive amination reaction of pyridine-4-aldehyde.
- N-ethyl-y-picolylamine (III) 25 grams of pyridine-4-aldehyde was dissolved in 90 ml. of 95% ethanol, added 45 grams of a solution of 70% ethylamine and the mixture was allowed to stand for overnight. After vaporizing the solvent from the mixture, the mixture was distilled under the decreased pressure to obtain the Schiff base. There was obtained 30 grams of the Schiff base having boiling point of 86-87" (4 mm. Hg).
- N-ethyl-N- ('y-picolyl) -phenylacet-amide (IV) 15 grams of N-ethyl-v-picolylamine was dissolved in a mixture of anhydrous-chloroform 120 ml. and pyridine 11 gram, and was added dropwise a solution of phenylacetic acid chloride '19 grams and chloroform 10 ml. being cooled with ice. After dropping was completed, the mixture was stirred up for 1-2 hours at a temperature of Then the chloroform layer was obtained after hydrolysis and distillation under decreased pressure was conducted to obtain the object having boiling point of 224-226 (3 mm. Hg).
- N-ethyl-N- ('y-picolyl) -trop-amide (I) 4 grams of formyl product (V) obtained from Example 3 and 3 grams of aluminum isopropylate was dissolved in 50 ml. of anhydrous-isopropyl-alcohol, and distilled for six hours at a rate of 10 drops per minute. After being cooled ofi, 30 ml. of dilute hydrochloric acid was added, treated in the same way as Example 3 and 4 grams of N- ethyl-N-('y-picolyl)-trop-amide could be obtained. This crystal corresponded with the already known specimen under infrared spectrum and film chromatography.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyridine Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP45002755A JPS4815947B1 (enrdf_load_stackoverflow) | 1970-01-09 | 1970-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3741975A true US3741975A (en) | 1973-06-26 |
Family
ID=11538146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00097374A Expired - Lifetime US3741975A (en) | 1970-01-09 | 1970-12-11 | Process for the production of n-ethyl-n-(gamma-picolyl) tropamide andintermediate therefor |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3741975A (enrdf_load_stackoverflow) |
| JP (1) | JPS4815947B1 (enrdf_load_stackoverflow) |
| CH (1) | CH560684A5 (enrdf_load_stackoverflow) |
| FR (1) | FR2075530A5 (enrdf_load_stackoverflow) |
| GB (1) | GB1288738A (enrdf_load_stackoverflow) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103159672A (zh) * | 2012-07-16 | 2013-06-19 | 湖南尔文生物科技有限公司 | 一种托品酰胺的制备方法 |
| CN103387534A (zh) * | 2012-05-09 | 2013-11-13 | 北大方正集团有限公司 | 一种拆分托吡卡胺外消旋体的方法 |
| CN109444312A (zh) * | 2018-10-19 | 2019-03-08 | 重庆市食品药品检验检测研究院 | 一种托吡卡胺杂质及用途 |
-
1970
- 1970-01-09 JP JP45002755A patent/JPS4815947B1/ja active Pending
- 1970-12-08 GB GB1288738D patent/GB1288738A/en not_active Expired
- 1970-12-11 US US00097374A patent/US3741975A/en not_active Expired - Lifetime
- 1970-12-17 CH CH1875770A patent/CH560684A5/xx not_active IP Right Cessation
-
1971
- 1971-01-07 FR FR7101049A patent/FR2075530A5/fr not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387534A (zh) * | 2012-05-09 | 2013-11-13 | 北大方正集团有限公司 | 一种拆分托吡卡胺外消旋体的方法 |
| CN103387534B (zh) * | 2012-05-09 | 2015-02-18 | 北大方正集团有限公司 | 一种拆分托吡卡胺外消旋体的方法 |
| CN103159672A (zh) * | 2012-07-16 | 2013-06-19 | 湖南尔文生物科技有限公司 | 一种托品酰胺的制备方法 |
| CN109444312A (zh) * | 2018-10-19 | 2019-03-08 | 重庆市食品药品检验检测研究院 | 一种托吡卡胺杂质及用途 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2100499A1 (de) | 1971-07-22 |
| GB1288738A (enrdf_load_stackoverflow) | 1972-09-13 |
| DE2100499B2 (de) | 1976-05-13 |
| FR2075530A5 (enrdf_load_stackoverflow) | 1971-10-08 |
| JPS4815947B1 (enrdf_load_stackoverflow) | 1973-05-18 |
| CH560684A5 (enrdf_load_stackoverflow) | 1975-04-15 |
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